This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A076611 #3 Mar 31 2012 14:40:00 %S A076611 2,3,5,7,131,151,353,373,727,757,929,10301,10501,11311,12721,13331, %T A076611 14341,14741,15551,16361,16561,19391,30203,30703,31513,32323,33533, %U A076611 34543,35353,35753,36263,36563,37273,37573,38783,39293,70207,70507 %N A076611 Palindromic primes with prime middle digit. %C A076611 There are no such numbers with an even number of digits. This sequence is quite similar to the sequence A071119 up to 12th term. %e A076611 a(12)=10301 is palindromic prime and its middle digit 3 is prime, a(13)=10501 is palindromic prime and its middle digit 5 is prime, a(14)=11311 is palindromic prime and its middle digit 3 is prime, ... %p A076611 ts_numprapal := proc(n) local ad,adr,midigit; ad := convert(n,base,10): adr := ListTools[Reverse](ad): if nops(ad) mod 2 = 0 then return 1; fi; midigit := op( (nops(ad)+1)/2,ad ): if (isprime( midigit )='true' and adr=ad) then return 0; else return 1; fi end: ts_pra_num_pal := proc(n) local p1; p1 := ithprime(n): if ts_numprapal(p1) = 0 then return (p1) fi end: apranumpal := [seq(ts_pra_num_pal(i), i=1..100000)]: apranumpal; %Y A076611 Cf. A002385, A069217, A071119. %K A076611 easy,nonn,base %O A076611 1,1 %A A076611 _Jani Melik_, Oct 21 2002